261544465362255 has 32 divisors (see below), whose sum is σ = 431818053316608. Its totient is φ = 135077146646400.

The previous prime is 261544465362203. The next prime is 261544465362269. The reversal of 261544465362255 is 552263564445162.

It is not a de Polignac number, because 261544465362255 - 2⁸ = 261544465361999 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1116592111 + ... + 1116826320.

It is an arithmetic number, because the mean of its divisors is an integer number (13494314166144).

Almost surely, 2^{261544465362255} is an apocalyptic number.

261544465362255 is a deficient number, since it is larger than the sum of its proper divisors (170273587954353).

261544465362255 is a wasteful number, since it uses less digits than its factorization.

261544465362255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233418687.

The product of its digits is 207360000, while the sum is 60.

The spelling of 261544465362255 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred sixty-five million, three hundred sixty-two thousand, two hundred fifty-five".